firmware-zd1211 software package provides binary firmware for the zd1211rw wireless driver, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install firmware-zd1211
firmware-zd1211 is installed in your system.
Make ensure the firmware-zd1211 package were installed using the commands given below,
$ sudo dpkg-query -l | grep firmware-zd1211 *
You will get with firmware-zd1211 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Kernels |
| Package | firmware-zd1211 |
| Version | 1:1.5-4 |
| Description | binary firmware for the zd1211rw wireless driver |
| Sub Section | Kernels |
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